/*
 * SonarQube
 * Copyright (C) 2009-2023 SonarSource SA
 * mailto:info AT sonarsource DOT com
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 3 of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
 */
package org.sonar.db.dialect;

import java.sql.DatabaseMetaData;
import java.sql.SQLException;
import java.util.List;
import org.apache.commons.lang.StringUtils;
import org.sonar.api.utils.Version;
import org.slf4j.LoggerFactory;

import static com.google.common.base.Preconditions.checkState;

public class PostgreSql extends AbstractDialect {
  public static final String ID = "postgresql";
  static final List<String> INIT_STATEMENTS = List.of("SET standard_conforming_strings=on", "SET backslash_quote=off");
  private static final Version MIN_SUPPORTED_VERSION = Version.create(9, 3, 0);
  private static final Version MIN_UPSERT_VERSION = Version.create(9, 5, 0);

  private boolean initialized = false;
  private boolean supportsUpsert = false;

  public PostgreSql() {
    super(ID, "org.postgresql.Driver", "true", "false", "SELECT 1");
  }

  @Override
  public boolean matchesJdbcUrl(String jdbcConnectionURL) {
    return StringUtils.startsWithIgnoreCase(jdbcConnectionURL, "jdbc:postgresql:");
  }

  @Override
  public List<String> getConnectionInitStatements() {
    return INIT_STATEMENTS;
  }

  @Override
  public boolean supportsMigration() {
    return true;
  }

  @Override
  public boolean supportsUpsert() {
    checkState(initialized, "onInit() must be called before calling supportsUpsert()");
    return supportsUpsert;
  }

  @Override
  public void init(DatabaseMetaData metaData) throws SQLException {
    checkState(!initialized, "onInit() must be called once");

    Version version = checkDbVersion(metaData, MIN_SUPPORTED_VERSION);

    supportsUpsert = version.compareTo(MIN_UPSERT_VERSION) >= 0;
    if (!supportsUpsert) {
      LoggerFactory.getLogger(getClass()).warn("Upgrading PostgreSQL to {} or greater is recommended for better performances", MIN_UPSERT_VERSION);
    }

    initialized = true;
  }
}
